docs: def send(self, message):
          """Send message to device."""
          serialized = message.SerializeToString()
  
          log_binary(_LOGGER, '>> Send', Data=serialized)
          if self._chacha:
              serialized = self._chacha.encrypt(serialized)
              log_binary(_LOGGER, '>> Send', Encrypted=serialized)
  
          data = write_variant(len(serialized)) + serialized
          self._transport.write(data)
          _LOGGER.debug('>> Send: Protobuf=%s', message)